simple past tense and past participle of fit in

(of clothing) Snug, skintight.

A room in a store for trying on clothes before purchase.

Baggy, not tight.

(of clothing) Snug, tight, form-fitting.

plural of Fitting subgroup

(mathematics) For a finite group G: the unique largest normal nilpotent subgroup of G, which intuitively represents the smallest subgroup that "controls" the structure of G when G is solvable.

present participle of fit out

(of clothing) Fitting closely to the body of the wearer, thus clearly revealing its shape.

poorly fitted / improperly matched; unsuitable